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2 files changed, 96 insertions, 0 deletions

diff --git a/lib/nanosleep.c b/lib/nanosleep.c
new file mode 100644
index 0000000000..b833c01f4a
--- /dev/null
+++ b/lib/nanosleep.c
@@ -0,0 +1,62 @@
+/* Provide a replacement for the POSIX nanosleep function.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#include <time.h>
+/* FIXME: is including both like this kosher?  */
+#include <sys/time.h>
+
+static interrupted;
+
+/* Sleep for USEC microseconds. */
+
+static void
+usleep (const struct timespec *ts_delay)
+{
+  struct timeval tv_delay;
+  tv_delay.tv_sec = ts_delay->tv_sec;
+  tv_delay.tv_usec = 1000 * ts_delay->tv_nsec;
+  select (0, (void *) 0, (void *) 0, (void *) 0, tv_delay);
+}
+
+int
+nanosleep (const struct timespec *requested_delay,
+	   struct timespec *remaining_delay)
+{
+  interrupted = 0;
+
+  /* set up sig handler -- but maybe only do this the first time?  */
+  /* FIXME */
+
+  usleep (requested_delay);
+
+  if (interrupted)
+    {
+      /* Calculate time remaining.  */
+      /* FIXME: the code in sleep doesn't use this, so there's no
+	 rush to implement it.  */
+    }
+
+  /* FIXME: Restore sig handler?  */
+
+  return interrupted;
+}
diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
new file mode 100644
index 0000000000..e4b634181b
--- /dev/null
+++ b/m4/nanosleep.m4
@@ -0,0 +1,34 @@
+#serial 1
+
+dnl From Jim Meyering.
+dnl FIXME
+dnl
+
+AC_DEFUN(jm_FUNC_NANOSLEEP,
+[
+ AC_CACHE_CHECK([whether nanosleep works],
+  jm_cv_func_nanosleep_works,
+  [AC_TRY_RUN([
+#   include <time.h>
+
+    int
+    main ()
+    {
+      struct timespec ts_sleep, ts_remaining;
+      ts_sleep.tv_sec = 0;
+      ts_sleep.tv_nsec = 1;
+      exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 1 : 0);
+    }
+	  ],
+	 jm_cv_func_nanosleep_works=yes,
+	 jm_cv_func_nanosleep_works=no,
+	 dnl When crosscompiling, assume the worst.
+	 jm_cv_func_nanosleep_works=yes)
+  ])
+  if test $jm_cv_func_nanosleep_works = no; then
+    AC_SUBST(LIBOBJS)
+    LIBOBJS="$LIBOBJS nanosleep.$ac_objext"
+    AC_DEFINE_UNQUOTED(nanosleep, gnu_nanosleep,
+      [Define to gnu_nanosleep if the replacement function should be used.])
+  fi
+])